Excessive rains following dry periods (like much of the northeast has seen...very dry winter followed by a very, very wet early spring) often causes landslides.
Is it really that far fetched that heavy rain could, on occasion, lead to quakes?
Especially considering we have decades old man-made means of dealing with water runoff. Instead of rain water permeating into the soil where it lands, now it gets funneled to one spot.